Parting compound for molders&#39; use.



IINITEI) STATES PATENT OFFICE.

ANNA E. DURKEE, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO THE ALASKA GARNET MINING AND MANUFACTURING COMPANY, A CORPORATION OF MINNESOTA.

PARTING COMIPOUND FOR MOLDERS USE.

No Drawing.

To all whom it may concern:

Be it known that I, ANNA E. Deanne, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Parting Compound for Molders Use, of which the following is a specification.

My invention relates to a parting com pound used by iron or metal molders to secure the parting of patterns from green sand as well as to secure the parting or separating of the metal from the sand when the molten metal is run into the molds.

In the preparation of molds for castings, great care must be exercised by the molder to so prepare the mold that when withdraw ing the pattern from the sand that the same will part from the impression without disturbiing the sand, and it is also necessary with all green sands used to apply some material to the pattern impression which will prevent the molten metal from forming a union with the sand or from penetrating the sand and thereby produce a rough surface upon the casting or make blow holes in the casting.

I have discovered that a composition of about 20 per cent. of alumina, per cent. of protoxid of iron and 35 per cent. of silica, when joined in chemical union, produces a parting compound for molders use that prevents sticking of sand to the patterns, as well as preventing the hot metal from adhering to the sand, and also prevents the hot metal from running into the sands.

My invention consists in providing a parting compound composed of alumina, protoxid of iron and silica of about the proportions named intimately mixed in chemical union and in a fine powdered form.

Specification of Letters Patent.

Application filed March 14, 1912.

Patented Sept. 23, 1913.

Serial No. 683,882.

I have discovered that when a material 5 such as ferrous-a1uminum garnets is reduced to a very fine powder and used as a parting powder that the alumina and iron in their chemical union with the silica pro vide a combination which reacts upon the metal and sand and causes the metal to cool smooth and clean without blow holes or adhering to the sand.

What I claim is 1. A parting compound for molders use consisting of alumina, protoxid of iron and silica combined in chemical union, substantially as set forth.

2. A parting compound for mohlers use consisting of substantially twenty per cent.

of alumina, forty-five per cent. of protoxid of iron and thirty-five per cent. of silica combined, substantially as set forth.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 8th day of March, 1912.

ANNA E. DURKEE.

In presence of F. M. TOWNSEND, P. H. SnnL'roN.

Copies 91' this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

